package main

import (
    "fmt"
    "strings" // 正确的包名是 strings
)

func main() {
    // 使用 strings.Contains 而不是 string.Contain
    fmt.Println(strings.Contains("seafood", "foo"))
	before1,found1:=strings.CutSuffix("strings.go",".go")
	fmt.Println(found1,before1)
}